csi sanford that will play out in the courtroom because the forensic will tell the story of the trajectory the bullet and whether it's possible or plausible what george zimmerman is at all true, coming up next. for protection while you're away. and right now you can get adt security installed starting at just $49, a savings of $250. but hurry. offer ends soon. don't wait. call right now or visit adt.com. this is a fire that didn't destroy a home. this is a break-in that didn't devastate a family. this is the reason why. adt. you can't predict when bad things will happen, but you can help protect yourself with the fast alarm response of adt, with 24/7 monitoring against burglary, fire, and high levels of carbon monoxide starting at just over $1 a day. this is the computer that didn't get stolen, keeping priceless photos and financial records safe. this is the reason why. take advantage of adt's summer savings. starting at $49 installed. hurry. offer ends july 8th. adt. always there. mpblt welcome back. i'm ashleigh banfield in florida and what can only be described as the hottest and muggie

sanford, florida. is it inevitable in any criminal justice procedure that eventually you're more than likely going to get at the csi a trial. it's like jurors expect a smoking gun. they want the science, and they are not happy if they don't get the science, and sometimes the prosecutors have to give the since, even when the science may not support their case comple completely. i want to turn to a dna expert or bring into the coverage tonight, defense attorney bradfo bradford cohen. sometimes i get confused to whose witness i'm watching in this case and strong for the prosecutors and then i think why on earth did they call this person? they all watch the shows at night. i want to play this testimony, had to do with trayvon martin's fingernails. a lot of times they are clipped and analyzed for whose dna is under beneath. >> from the right fingernail scapings of trayvon martin you did not find george zimmerman's dna, did you? >> the left hand stick was not tested for the possible presence of blood. it did not have any staining on it whatsoever. i swabbed that on the testing and did not get any dna results from that sw

sanford, florida, i'm ashleigh banfield. the dna evidence in the spotlight yesterday at the george zimmerman second-degree murder trial. it's the csiof this trial where the mystery goes down to the molecule. trayvon martin's fingernails, as well as the sweatshirt he was wearing the night he was killed and that gun zimmerman used to kill him, all featured heavily in the courtroom yesterday. and all of them tested in the effort to get to the bottom of what exactly happened in the scuffle between those two people that night. joining me to figure out what mattered and what really didn't in all of that very arcane information is defense attorney midwin charles, jean jecasarez,o one knows more about this trial than jean, and defense attorney jeff gould, who's also able to weigh in on critical aspects of this case. jean, i want to start with you, because i need you to boil down the biggest thing, if there was one, that those jurors might be stewing over today, because they have to sit and think. they can't be with their families at their homes and doing 4th of july things, they have to think about everything that happened today. what stoo